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Spin-orbital entanglement and violation of the Goodenough-Kanamori rules

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Oleś,  A. M.
Department Quantum Many-Body Theory (Walter Metzner), Max Planck Institute for Solid State Research, Max Planck Society;

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Horsch,  P.
Department Quantum Many-Body Theory (Walter Metzner), Max Planck Institute for Solid State Research, Max Planck Society;

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Khaliullin,  G.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Oleś, A. M., Horsch, P., Feiner, L. F., & Khaliullin, G. (2006). Spin-orbital entanglement and violation of the Goodenough-Kanamori rules. Physical Review Letters, 96(14): 147205.


Cite as: https://hdl.handle.net/21.11116/0000-000F-028B-2
Abstract
We point out that large composite spin-orbital fluctuations in Mott
insulators with t(2g) orbital degeneracy are a manifestation of quantum
entanglement of spin and orbital variables. This results in a dynamical
nature of the spin superexchange interactions, which fluctuate over
positive and negative values, and leads to an apparent violation of the
Goodenough-Kanamori rules.